Located at the tip of Old San Juan's peninsula, El Morro fortress dominates the landscape, with its massive gold-colored walls glistening in the Caribbean sun. Built in 1539 to defend San Juan Bay, the fort's sprawling stone design, impressive seaside location and rich historical legacy make it one of the city's most popular attractions. There's also a museum, a gift shop, lookout telescopes, and the best views of the Atlantic Ocean and the bay. June-November daily 9 am-5 pm; December-May daily 9 am-6 pm. US$3 adults, free for children younger than 16. US$5 adults for combined entrance to the Castillo de San Cristobal and Castillo de San Felipe del Morro. Calle Norzagaray (at the end of the street), Old San Juan, San Juan. Phone 787-729-6960. http://www.nps.gov/saju.
